Green tea with lemon and vodka over lashings of ice.
Mint tea with vodka and ice is also quite nice and refreshing.

Fruit flavoured tea’s are great for real cocktails, such as peach and coconut tea’s brewed strongly (perhaps only half a mug each) with a shot white rum and a shot of whisky. I did these at my dads birthday party and people thought I was mad but when they tried it they all loved it and requested it through the night. The water from the tea makes it very refreshing and doesn’t really leave much of a hangover. :)